1//===-- msan_thread.h -------------------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file is a part of MemorySanitizer.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef MSAN_THREAD_H
14#define MSAN_THREAD_H
15
16#include "msan_allocator.h"
17#include "sanitizer_common/sanitizer_common.h"
18#include "sanitizer_common/sanitizer_posix.h"
19namespace __msan {
20
21class MsanThread {
22 public:
23  static MsanThread *Create(thread_callback_t start_routine, void *arg);
24  static void TSDDtor(void *tsd);
25  void Destroy();
26
27  void Init();  // Should be called from the thread itself.
28  thread_return_t ThreadStart();
29
30  uptr stack_top();
31  uptr stack_bottom();
32  uptr tls_begin() { return tls_begin_; }
33  uptr tls_end() { return tls_end_; }
34  bool IsMainThread() { return start_routine_ == nullptr; }
35
36  bool AddrIsInStack(uptr addr);
37
38  bool InSignalHandler() { return in_signal_handler_; }
39  void EnterSignalHandler() { in_signal_handler_++; }
40  void LeaveSignalHandler() { in_signal_handler_--; }
41
42  void StartSwitchFiber(uptr bottom, uptr size);
43  void FinishSwitchFiber(uptr *bottom_old, uptr *size_old);
44
45  MsanThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; }
46
47  int destructor_iterations_;
48  __sanitizer_sigset_t starting_sigset_;
49
50 private:
51  // NOTE: There is no MsanThread constructor. It is allocated
52  // via mmap() and *must* be valid in zero-initialized state.
53  void SetThreadStackAndTls();
54  void ClearShadowForThreadStackAndTLS();
55  struct StackBounds {
56    uptr bottom;
57    uptr top;
58  };
59  StackBounds GetStackBounds() const;
60  thread_callback_t start_routine_;
61  void *arg_;
62
63  bool stack_switching_;
64
65  StackBounds stack_;
66  StackBounds next_stack_;
67
68  uptr tls_begin_;
69  uptr tls_end_;
70
71  unsigned in_signal_handler_;
72
73  MsanThreadLocalMallocStorage malloc_storage_;
74};
75
76MsanThread *GetCurrentThread();
77void SetCurrentThread(MsanThread *t);
78
79} // namespace __msan
80
81#endif // MSAN_THREAD_H
82